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== Functions vs. Values ==
The article talks about "the functions <math>f(x_i,\boldsymbol \beta+\boldsymbol \delta)</math>". This confused the heck out of me, until I realized that what is meant is the values of the function <math>f(x,\boldsymbol \beta+\boldsymbol \delta)</math> at <math>x_i</math>. Similar confused terminology is used at other points in the article, for example when calling <math>J_i</math> the gradient. These kind of terminology issues make the article hard to read.
== Inconsistency ==
In the article is says that Levenberg's contribution is in introducing lambda. But at the same time in the references it says that he was the first to publish the algorithm in 1944 or something. This seems a bit contradictory to me.
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